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// Portions Copyright [2016] [Payara Foundation and/or its affiliates]

package org.glassfish.admin.mbeanserver;

import org.glassfish.hk2.api.ServiceLocator;

import javax.management.MBeanServer;
import javax.management.InstanceAlreadyExistsException;
import javax.management.MBeanRegistrationException;
import javax.management.NotCompliantMBeanException;

import javax.management.remote.*;
import javax.management.remote.jmxmp.JMXMPConnectorServer;

import java.io.IOException;
import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.Map;

/**
 * Start and stop JMX connectors.
 */
final class JMXMPConnectorStarter extends ConnectorStarter {
    JMXMPConnectorStarter(final MBeanServer mbeanServer, final String address, final int port, final boolean securityEnabled,
            final ServiceLocator habitat, final BootAMXListener bootListener) {
        super(mbeanServer, address, port, securityEnabled, habitat, bootListener);
    }

    public synchronized JMXConnectorServer start() {
        if (mConnectorServer != null) {
            return mConnectorServer;
        }

        final boolean tryOtherPorts = false;
        final int TRY_COUNT = tryOtherPorts ? 100 : 1;

        int port = mPort;
        int tryCount = 0;
        while (tryCount < TRY_COUNT) {
            try {
                mConnectorServer = startJMXMPConnectorServer(port);
                break;
            } catch (final java.net.BindException e) {
            } catch (final Exception e) {
                throw new RuntimeException(e);
            }

            if (port < 1000) {
                port += 1000; // in case it's a permissions thing
            } else {
                port = port + 1;
            }
        }
        return mConnectorServer;
    }

    public static final String JMXMP = "jmxmp";

    private JMXConnectorServer startJMXMPConnectorServer(final int port) throws MalformedURLException, IOException,
            InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException {
        final Map<String, Object> env = new HashMap<String, Object>();
        env.put("jmx.remote.protocol.provider.pkgs", "com.sun.jmx.remote.protocol");
        env.put("jmx.remote.protocol.provider.class.loader", this.getClass().getClassLoader());
        env.put("jmx.remote.rmi.server.credential.types", new String[] { String[].class.getName(), String.class.getName() });

        JMXAuthenticator authenticator = getAccessController();
        if (authenticator != null) {
            env.put("jmx.remote.authenticator", authenticator);
        }

        final JMXServiceURL serviceURL = new JMXServiceURL("service:jmx:" + JMXMP + "://" + hostname() + ":" + port);
        JMXConnectorServer jmxmp = null;

        boolean startedOK = false;
        try {
            jmxmp = new JMXMPConnectorServer(serviceURL, env, mMBeanServer);
            if (mBootListener != null) {
                jmxmp.addNotificationListener(mBootListener, null, serviceURL.toString());
            }

            jmxmp.start();
            startedOK = true;
        } catch (final Exception e) {
            e.printStackTrace();
        } finally {
            // we do it this way so that the original exeption will be thrown out
            if (!startedOK) {
                try {
                    if (jmxmp != null) {
                        jmxmp.stop();
                    }
                } catch (Exception e) {
                    ignore(e);
                }
            }
        }

        mJMXServiceURL = serviceURL;
        mConnectorServer = jmxmp;

        // verify
        // final JMXConnector jmxc = JMXConnectorFactory.connect(serviceURL, null);
        // jmxc.getMBeanServerConnection().getMBeanCount();
        // jmxc.close();

        return mConnectorServer;
    }
}
